Fruit’s health halo is overstated. For people with fragile digestion, some popular choices behave less like medicine and more like sandpaper on gastric mucosa, the protective lining that keeps stomach acid in check.
Most overlooked is acidity. Citrus and pineapples carry high titratable acidity and organic acids such as citric acid, which can lower intragastric pH and aggravate existing gastritis or peptic ulcer lesions, especially when eaten on an empty stomach or in large, continuous portions.
Equally underestimated is mechanical and chemical stress. Unripe persimmons contain tannins that can precipitate with gastric proteins and form hard concretions, while crunchy, high-fiber skins push gastric peristalsis to work harder than compromised smooth muscle is ready for, amplifying cramps or nausea instead of relieving them.
The sweet trap is fructose. Apples and pears, when eaten in excess by people with poor fructose absorption or irritable bowel tendencies, can drive osmotic diarrhea, gas and upper abdominal pressure as unabsorbed fructose ferments in the intestine and reflexively worsens perceived stomach discomfort.
